The theory presented here predict protein emission/absorption of biophotons of 300 nm and 500-700 nm wavelengths, based on the energy level transitions of the excitons (in a maner similar to the Resonant Recognition Model , but this last is based on the 'energy of delocalized electrons for each amino acid', and for example in the cited paper authors found wavelengths of 230 nm and 1000 nm).
" The mechanism and properties of bio-photon emission and absorption in bio-tissues were studied using Pang’s theory of bio-energy transport, in which the energy spectra of protein molecules are obtained from the discrete dynamic equation. From the energy spectra, it was determined that the protein molecules could both radiate and absorb bio-photons with wavelengths of < 3 μm and 5–7 μm, consistent with the energy level transitions of the excitons. These results were consistent with the experimental data; this consisted of infrared absorption data from collagen, bovine serum albumin, the protein-like molecule acetanilide, plasma, and a person’s finger, and the laser-Raman spectra of acidity I-type collagen in the lungs of a mouse, and metabolically active Escherichia coli. We further elucidated the mechanism responsible for the non-thermal biological effects produced by the infrared light absorbed by the bio-tissues, using the above results. No temperature rise was observed; instead, the absorbed infrared light promoted the vibrations of amides as well the transport of the bio-energy from one place to other in the protein molecules, which changed their conformations. These experimental results, therefore, not only confirmed the validity of the mechanism of bio-photon emission, and the newly developed theory of bio-energy transport mentioned above, but also explained the mechanism and properties of the non-thermal biological effects produced by the absorption of infrared light by the living systems."
So proteins are a source of biophotons.
 Murugan, N. J., Karbowski, L. M., & Persinger, M. A. (2014). Cosic’s Resonance recognition model for protein sequences and photon emission differentiates lethal and non-lethal ebola strains: Implications for treatment. Open Journal of Biophysics, 5(01), 35.
Last modified on 15-Mar-16